/* wf_atanh.c -- float version of w_atanh.c.
 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
 */

/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunPro, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice
 * is preserved.
 * ====================================================
 */
/*
 * wrapper atanhf(x)
 */

#include "fdlibm.h"
#include <errno.h>

#ifdef __STDC__
    float atanhf(float x)       /* wrapper atanhf */
#else
    float atanhf(x)         /* wrapper atanhf */
    float x;
#endif
{
#ifdef _IEEE_LIBM
    return __ieee754_atanhf(x);
#else
    float z,y;
    struct exception exc;
    z = __ieee754_atanhf(x);
    if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
    y = fabsf(x);
    if(y>=(float)1.0) {
        if(y>(float)1.0) {
                /* atanhf(|x|>1) */
                exc.type = DOMAIN;
                exc.name = "atanhf";
        exc.err = 0;
        exc.arg1 = exc.arg2 = (double)x;
                exc.retval = 0.0/0.0;
                if (_LIB_VERSION == _POSIX_)
                    Djy_SaveLastError(EDOM);
                else if (!matherr(&exc)) {
                    Djy_SaveLastError(EDOM);
                }
        } else {
                /* atanhf(|x|=1) */
                exc.type = SING;
                exc.name = "atanhf";
        exc.err = 0;
        exc.arg1 = exc.arg2 = (double)x;
        exc.retval = x/0.0; /* sign(x)*inf */
                if (_LIB_VERSION == _POSIX_)
                  Djy_SaveLastError(EDOM);
                else if (!matherr(&exc)) {
                  Djy_SaveLastError(EDOM);
                }
            }
        if (exc.err != 0)
              Djy_SaveLastError(exc.err);
            return (float)exc.retval;
    } else
        return z;
#endif
}

#ifdef _DOUBLE_IS_32BITS

#ifdef __STDC__
    double atanh(double x)
#else
    double atanh(x)
    double x;
#endif
{
    return (double) atanhf((float) x);
}

#endif /* defined(_DOUBLE_IS_32BITS) */
